Use of ferric-impregnated volcanic ash for arsenate (V) adsorption from contaminated water with various mineralization degrees

► Volcanic ash was first used for arsenic removal from aqueous medium. ► The ferric-impregnated volcanic ash (FVA) shows high arsenic removal ability. ► We created a win-win system for waste utilization and disposal of environmentally accumulated hazard. ► Iron-arsenic coprecipitation and electrostatic attraction on FVA surfaces may be responsible for the tight bonding of As. ► The deionized batch experiment should not be extrapolated directly to all cases.